Process of manufacturing artificial threads.



' solution the Process of Manufacturing Artificial ticial threads has the tendency to coagulate through capillary tubes and coagulatcd by.

ERNST BECHTEL, 0F HANAU, GERMANY,

KUNSTSEIDE-FABRIK G. M. B. H., 0F

ASSIGNOR TO THE FIRM 0F HANAUER HANAU, GERMANY.

PROCESS OF MANUFACTURING ARTIFICIAL TH READS.

No Drawing.

Specification of Letters Patent.

Patented Apr. 4, 19i1.

To all whom it may concern.-

' Be it known that I, ERNST BECIITEL, a subject of the German Emperor, and resident of Hanau-on-the-lilain, Germany, have inventetLcertain new and useful Improvements in 'lhreads, fication. I

This invention relates to improvements in a process of mimu'taetiu'ing artilicial threads from solutions of cellulose with anunoniurcted cupric oxid.

.-\s is known in the art. the soliltion of cellulose with ammoniuretcd cupric oxid heretofore used in the manufacture of artiof which the following is a speciinto drops when flowing out from a receptacle in a fine stream. 'lheret'ore, it was nec essary, in order to make threads, to force the said solution through very fine apertures. It was also necessary to keep the solutions at low temperatures.

The ol'ijcct of the present improvements is to provide a process in which the use of such tine apertures and of the low temperaures is dispensed-with. For this purpose, substances of a slimy or gelatinous nature are added to the said solution of cellulose, by which the tendency of the solution to coagulatc into drops is removed. so that it can be spun into threads in a similar way as honey. The substances which have proved particularly useful for the said purpose are sodium ricinolcate, glycerin, or gelatin. By adding substances of the character described to the solution of cellulose with au'nnoniurcted cupric oxid the capillary tubes heretofore necessary for spinning the said solution, and the filtration of the solution are dispensed with, because even foreign matter of comparatively large size does not prevent a continuous spinning of the threads by' tearing the latter. and furthermore the pliability and the silky luster ot' the threads is imliroved.

In United States Letters Patent No. 7$)8,St' t-" it has been suggested to add to the of cellulose with auunonilu'eted cupric oxid -a solution ofsilk gum such as iobtained by boiling raw silk. 'l'hcrcby the 'oxid,

thread which is in the usual way t'orced Application filed February 19, 1909. Serial No. 478,766.

means of acids, assumes a certain similarity to the natural silk, particularly in so far as it is thereby rendered i in' ermeable to water. However, such a liquor HIS no slimy charactor and, therefore, it is not possible, as in the process of the present invention, to make the solution more viscid and thereby to permit the same to be spun without using capillary tubes. Furthermore. according to the present invention, the substances added to the solution of the cellulose are not intended to remain within the threads, but leave them during the coagulating and washing process, their purpose being exclusively to make the solution more riscld, and to increase its 00- hesion, so that it can be spun withoutcapillary tubes.

Example :A solution of Lttkg. of sodiunr ricinoleate in 3 liters of warm water, or a. solution of 0.5 kg. of cupric ricinoleate in 2 liters of a '15 per cent. solution of ammonia, are added to 200 kg.- of an 8 per cent. solution of cellulose in ammoniureted cupric whereupon the mixture is thoroughly stirred about one or two hours. .To produce the best results in spinning the solution, the amount of the substances added to the solution of the cellulose may be varied according to the quality of the latter. Under ordinary circumstances good results will be obtained,

if the substances added to the solution of the cellulose amount to 10 per cent. of the cellulose.

Having thus described the invention what is claimed is The herein described composition of mat ter, from which artificial threads may be 'spun, consisting of a solutlon of cellulose and aunnoniuretml cupric oxid. and sodium ricinoleate. the latter being added in such amount that the slimy character of the solution is greatly increased and to such a degree that the solution can be spun without the use of capillary tubes and without pressure, substantially as described.

in testimony whereof I' have signed my name to this specification in the presence of two subscribing witnesses.

ERNST BEOHTEL. \Vitnesses:

FRANZ Ilassmcuen, EuwiN DIPIEL. 

